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## Main Question or Discussion Point

I'd be glad if anyone could help me out here. I guess this is closer related to maths, but in any case there is dynamics behind it. So when we want to express acceleration

Thanks for clearing this up for me.s

**a**using displacement**s**, , it looks like this, right?**a = d^2s/dt^2**. What I don't understand is that if you substitute**v**whith**ds/dt**, why don't you get**d^2s/((d^2)t^2)**i.e. why is time not a second differential? Just by mechanically carrying out the substitution I think I should get a second differential for time...**a = d(ds)/((dt)dt)**Thanks for clearing this up for me.s

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